Thank you for your post. Have you saved the password for MyRogers login? It could be the browsers are trying to load the saved password and failing. Have you tried clearing temporary files and cookies yet?
You didn't tell Firefox (or IE) to remember your ligin and passeord? Go to Tools > Options > Security and Saved Logins and searchfor 'rogers' and delete anything saved. Then sign in again and say yes to remember password.